Flutter : Scaffold,Appbar,FAB


What is Scaffold?

A Scaffold Widget provides a framework which implements the basic material design visual layout structure of the flutter app. It provides APIs for showing drawers, snack bars and bottom sheets. Have a look at its constructor and the properties it has. We are going to overview it’s parameters one by one.

Image for post 

  • appBar
     An appBar is to display at the top of the scaffold it’s one of the primary content of Scaffold without which a scaffold widget is incomplete. It defines what has to be displayed at the top of the screen. appBar uses the AppBar widget properties through Scaffold.appBar. This AppBar widget itself has various properties like title, elevation,brightness etc to name a few.
  • body
    body is the other primary and minimum required property of the scaffold which signifies the area below the app bar and behind the floatingActionButton and drawer. Any widget in the body of scaffold is positioned at the top-left corner by default.
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('Flutter Scaffold'),
    ),
    body: Center(
      child: Text("This is Homepage",
        style: TextStyle(
          color: Colors.black,
          fontSize: 40.0,
          fontStyle: FontStyle.italic,
        ),
      ),
    ),

Here, the body property of the Scaffold is used to display a text “This is HomePage”. The Centre widget is used to align the text at the centre of the body and a Text widget is used to give the text along with it’s style property which gives the text a color, fontsize and fontstyle. Don’t worry this blog isn’t about the Centre or Text or TextStyle widgets, they will be covered later.

  • floatingActionButton
    A floatingActionButton is a button displayed floating above body in the bottom right corner. It is a circular icon button that hovers over content to promote a primary action in the application. floatingActionButton uses the FloatingActionButton widget properties through Scaffold.floatingActionButton.Image for post
  • drawer  A drawer is a panel displayed to the side of the body, often hidden on mobile devices. One usually has to swipe left to right or right to left to access the drawer. It uses the Drawer widget properties which is a material design panel that slides in horizontally from the edge of a Scaffold to show navigation links in an application and this widget is used in scaffold using .Image for post

 

Comments

Post a Comment

Popular posts from this blog

Flutter: Exploring more widgets

Image
Checkbox A checkbox is a type of input component which holds the Boolean value. It is a GUI element that allows the user to choose multiple options from several selections . Here, a user can answer only in yes or no value. A marked/checked checkbox means yes, and an unmarked/unchecked checkbox means no value. Typically, we can see the checkboxes on the screen as a square box with white space or a tick mark. A label or caption corresponding to each checkbox described the meaning of the checkboxes. In this article, we are going to learn how to use checkboxes in Flutter. In Flutter , we can have two types of checkboxes: a compact version of the Checkbox named "checkbox" and the "CheckboxListTile" checkbox, which comes with header and subtitle. The detailed descriptions of these checkboxes are given below:       Flutter Radio Button A radio button is also known as the options button which holds the Boolean value . It allows the user to choose only one option f
Read more

Flutter: Everything is a widget

Image
  Widgets The core concept of the Flutter framework is In Flutter, Everything is a widget . Widgets are basically user interface components used to create the user interface of the application. In Flutter , the application is itself a widget. The application is the top- level widget and its UI is build using one or more children (widgets), which again build using its children widgets. This composability feature helps us to create a user interface of any complexity. For example, the widget hierarchy of the hello world application (created in previous chapter) is as specified in the following diagram −   Here the following points are worth notable − MyApp is the user created widget and it is build using the Flutter native widget, MaterialApp . MaterialApp has a home property to specify the user interface of the home page, which is again a user created widget, MyHomePage . MyHomePage is build using another flutter native widget, Scaffold Scaffold has two properties – body an
Read more

Food Delivery App 5 - Firebase Storage for Profile Picture

Image
  Adding Images to Firebase Storage We can use image picker to get our images from gallery. So to add the selected images to Firebase Storage, we can create a edit icon to save the images to storage uploadPic   Widget build(BuildContext context) { Future getImage() async { var image = await ImagePicker.pickImage(source: ImageSource.gallery); setState(() { _image = image; print('Image Path $_image'); }); } Future uploadPic(BuildContext context) async{ String fileName = basename(_image.path); StorageReference firebaseStorageRef = FirebaseStorage.instance.ref().child(fileName); StorageUploadTask uploadTask = firebaseStorageRef.putFile(_image); StorageTaskSnapshot taskSnapshot=await uploadTask.onComplete; setState(() { print("Profile Picture uploaded"); Scaffold.of(context).showSnackBar(SnackBar(content: Text('Profile Picture Uploaded')));
Read more